Abstract
The reactivity of molten titanium with various refractory oxides(SiO2, Al2O3, MgO, CaO, ZrO2)was investigated experimentally.Titanium castings were obtained using the investments composed purely of refractory oxides and without any additional components except water or sols or MMA as temporary binder, which get decomposed away with burning.The surface of the titanium castings was observed by optical and electron microscopy.Elemental analysis was done using ESCA.The surface products were identified using the thin foil X-ray diffaction method(TFD).Of thess refractory oxides, SiO2 was the most reactive with titanium, followed by Al2O3.The reaction products included Ti-Si, Ti-Al compounds other than Ti oxides.MgO, CaO, ZrO2 show very little reaction and principal surface products were Ti oxides.Reactivity, reaction layer thickness and reaction products were determined and their mechanism was discussed.
